I have an invisible, part-time disability. I used to have a wheelchair and a handicapped hang tag, but I got rid of the tag because it wasn't worth getting hassled everywhere I parked. Thankfully, the medication is helping and I haven't needed the wheelchair in a very long time, but that doesn't mean I won't need it tomorrow.
It's like people want any excuse to be a righteous jackass.
In general if you're parking across 2+ parking spots you're an asshole, no matter if the parking spots are disabled or not. There are exceptions, but one would have to be considerate in how one parks for those to be legitimate (IMHO).